ESPEasy: How to add a 15 s condition for t#Ktz>70 and flow<1 in the rules script?

Hi,

I would like to create a script like the one below, but it is missing one key thing. I would like this condition of higher temp and no flow to last at least 15 s . How to do this? Is it with a looptimer or timerset? Or some kind of variable, but I need it to be done for me as I won't grasp it myself.
Or can I hit this forum:
https://www.letscontrolit.com/forum/viewtopic.php?t=10853
?

On t#Ktz Do
If t#Ktz>70 And flow<1 // if temperature rises above 70*C and flow drops below 1 l/min
GPIO,2,1 // activate alarm
Else
GPIO,2,0
Endon

https://espeasy.readthedocs.io/en/latest/Rules/Rules.html

I have created a script with a variable, all that is left is to add a timer, but I don't know how. So that an event lasts for example 5 seconds and only the next one.